How Close Is Too Close For Wide Band o2?

I have a 2013 Charger R/T I just installed a blower on w/stock exhaust manifolds and cats.
I want to install an AEM OBD interface o2 sensor pre-cat but its a short run between the cat and the manifold opening. Maybe I can get 4 to 8 inches down form it.
Is that totally too close? I have read WB o2 instructions to install sensors closer because the car had an air pump and they want it before the pump injection.

Too close? Waste of time?

Thanks

I think u've answered your question. That is a waste of time

Thanks, Its been a while since the post. I have installed it 9-inches away from the manifold with on problems so far.

I read o2 install instructions for if one has air injection where the manifolds meet the heads to install it right at the ports. So 9 inches away should hold up.